H04L1/00—Arrangements for detecting or preventing errors in the information received

H04L2001/0092—Error control systems characterised by the topology of the transmission link

H04L2001/0097—Relays

Abstract

The invention discloses a method for transmitting multicast data of a WiMax/WiBro relay system, which comprises the following steps: users send a CINR to respective relay stations; a judgment module of a multiwave modulating encoding mode of a relay selects the minimum value from a plurality of CINRs and determines the modulating encoding mode on the basis of the value; a report module of the multiwave modulating encoding mode of the relay sends the modulating encoding mode to a base station; a selection module of the multiwave modulating encoding mode of the base station selects one modulating encoding mode with highest speed from the multiwave modulating encoding modes of different relays as the modulating encoding mode of the multiwave data on an access link, and sends the final modulating encoding mode to the relay; a transmitting module of the multiwave data on the access link of the base station and the transmitting module of the multiwave data on the access link of the relay send the data in the modulating encoding mode determined by the base station. In the invention, a method combining the high-order modulation and repetition is used for transmitting the multicast data, thus realizing flexible and high-efficient utilization of radio resources.

Description

本发明涉及包含中继的蜂窝系统，特别涉及WiMax&WiBro中继系统中多播数据的高效传输方法。 The present invention relates to a cellular system comprising a relay, in particular, it relates to an efficient method of transmitting WiMax & WiBro relay system multicast data.

背景技术 Background technique

在WiMax/WiBro中继系统中传输多播数据时，为了提升信号功率并降低干扰，通常需要基站和参与多播的多个中继站同时传送具有相同编码/调制的数据。 When transmitting a multicast data WiMax / WiBro relay system, in order to improve the signal power and reducing interference, usually a plurality of base stations and relay stations participating in a multicast transmission, while having the same encoding / data modulation.在这种传送方式下，通常相邻中继站或基站的干扰变成了有用的信号。 In this transmission system, typically adjacent interference base station or the relay station becomes a useful signal.从用户端来说，来自不同发射端的信号可以看成多径信号，只要它们之间的差异在OFDM符号的保护间隔之内，都可以作为有用信号正确接收。 From the user terminal, the signal from a different transmitter can be viewed as a multipath signal, as long as the difference between them is within the guard interval of the OFDM symbol, can be used as a useful signal received correctly.

在传统的WiMax/WiBro中继系统中传输多播数据时，由于接收者距离中继或基站的距离不同，造成信道差异非常大。 In a conventional WiMax / WiBro relay system when transmitting multicast data, since the receiver at different distances from the base station or the relay, resulting in very different channel.为了适应信道较差的接收者能够以某种可以接受的概率正确解码数据，多播数据通常采用较低阶调制加较强编码，这对信道状况好的用户来说资源浪费比较严重。 To accommodate poor channel receiver can correctly decode a certain probability can accept data, multicast data commonly used lower order modulation plus strong coding, which for good channel conditions for users serious waste of resources.

数字视频广播陆地方案DVB-T中提出了一种叫做等级调制(hierarchicalmodulation)的方法，该方法在高阶调制中嵌入低阶调制信号， 例如在64QAM或16QAM中嵌入QPSK进行传输。 Terrestrial Digital Video Broadcasting DVB-T scheme proposes a method called level modulation (hierarchicalmodulation), the method embedded in a high order modulation signal is modulated in low order, for example, embedded in the transmitted QPSK 64QAM or 16QAM in.等级调制方法和DVB-T 中的视频传输密切相关。 Level modulation method and DVB-T are closely related to video transmission.一段高清的视频通常可以分为基本层和多个增强层，其中基本层能够提供普通清晰度的视频，增强层单独无法解码出视频，必须加上基本层才可以提供更为清晰的视频流。 HD video section generally can be divided into a plurality of the base layer and enhancement layer, the base layer can be provided wherein the general definition video, the enhancement layer video can not be decoded alone, must be added to the base layer can provide a more clear video stream.因此，基本层是高优先级流，通常是用低阶调制加强编码，以确保用户能正确接收；而增强层是低优先级流，采用高阶调制加弱编码进行传输。 Thus, the base layer is a high priority stream, typically encoded with a low order modulation to strengthen, to ensure that the user receives correctly; while the enhancement layer is a low priority flow, higher order modulation plus encoding weak transmission.等级调制把高优先级的基本层嵌入到低优先级增强层中进行传输，信道质量好的用户可以同时解码基本层和增强层，从而得到高清的视频；而信道质量差的用户可以解码基本层，只能得到基本清晰度的视频。 Order modulation to a high priority base layer embedded in the low-priority enhancement layer for transmission, a good channel quality of the user can simultaneously decode base layer and enhancement layer, to obtain a high-definition video; the poor channel quality of the user can decode the base layer You can only get basic video clarity.等级调制的方案中，高阶调制的增强层信号对低阶调制的基本层信号在星座图上存在干扰，因此DVB-T中提出了可调节的分割因子"，即代表低阶调制的星座点在星座图上最少需要相隔"个最小星座点距离。 Level modulation scheme, the high-level modulation enhancement layer signal to base layer signal modulated in low order constellation is present on the interference, therefore proposed DVB-T adjustable division factor ", which represents the low-order modulation constellation points in the constellation requires a minimum apart "smallest constellation point distance.增大a可以降低高阶调制的信号对低阶调制的信号的干扰。 Increasing a high-level modulation signal can be reduced interference signal modulated in low order.另一方面， 增大《同时降低了最小星座点距离，这就意味着需要更高的信干噪比才能区分高阶调制的两个不同星座点。 On the other hand, increases "while reducing the minimum distance of the constellation points, which means that higher SINR to distinguish between two different constellation points higher order modulation.分割因子"其实是调节着高阶调制和低阶调制的相互干扰状况，a越大则低阶调制对高阶调制的干扰越大， «越小则高阶调制对低阶调制的干扰越大。 The larger the division factor "is actually regulates the mutual interference conditions and low-order modulation order modulation, a is the larger the larger the interference order modulation order modulation,« smaller the low order modulation on the high order modulation of the interference .

等级调制的方案比较适合广播业务中传输视频数据，应用到WiMax 和WiBro系统中则不是很合适，主要有以下一些原因： 第一、等级调制需要对接收端进行比较重大的修改，尤其是需要根据分割因子a进行星座图调整的时候；目前WiMax和WiBro系统得修订版都强调接收端需要向下兼容； Order modulation scheme is more suitable for transmitting video data broadcasting service, WiBro and WiMax applied to the system is not very suitable, mainly in the following reasons: First, the level of modulation requires major changes compared to the receiving side, according to particular needs when dividing a constellation of FIG factor adjustment; current WiMax and WiBro systems have emphasized Rev. receiver needs downward compatibility;

第二、等级调制中高阶调制部分只能用于信道状况好的用户接收信号， 而不能用于其它用户。 Second, high order modulation level modulation section only for a good channel condition of the user received signal, and not for other users.在非视频业务中，如果该信道状况好的用户没有数据要接受，那么这段资源仍然是浪费； In non-video business, if the user does not have a good channel condition data to be accepted, then this is still a waste of resources;

第三、等级调制中虽然可以使用分割因子对星座图进行调整从而达到在高阶调制信号和低阶调制信号之间调节干扰的目的，但由于这两种信号都是在同一星座图进行传输，因此无法调节不同信号的发射功率，从而失去了功率控制这一有效控制干扰的手段。 Third, although the level of modulation can be adjusted using a constellation division factor to achieve the purpose of adjusting the interference between the high-order and low-order-modulated signal the modulation signal, but since these two signals are transmitted in the same constellation, can not adjust the transmit power of different signals, thus losing the power to control this effective means of controlling interference.

发明内容 SUMMARY

本发明的目的是提供一种WiMax&WiBro中继系统中多播数据的高效 Object of the present invention is to provide an efficient one kind WiMax & WiBro relay system, the multicast data

中继的多波调制编码模式判决模块，从多个载波信号干扰比中选择最小值，并根据该值决定调制编码模式； Relaying multi-wave modulation coding mode decision module, a minimum value is selected from a plurality of carrier signal to interference ratio, and determines the modulation coding mode based on the value;

中继的多波调制编码模式报告模块，将调制编码模式发送给基站；基站的多波调制编码模式选择模块，根据来自不同中继的多波调制编码模式选择其中速率最高的一个作为访问链路上多波数据的调制编码模式，并将该最终调制编码模式发送给中继； Relaying multi-wave modulation coding mode reporting module, the modulation coding mode to a base station; multi-wave modulation coding mode of the base station selection module to select a highest rate among the access link as the multi-wave modulation coding mode different from the relay modulation coding mode of the multi-wave data and the modulation coding mode to a final relay;

本发明使用高阶调制加重复的方法传送多播数据，对于信道状况差的用户采用多次重复，对于信道状况好的用户减少重复次数或不重复， 节省下来的子信道可以用来传送其它数据，从而达到了灵活高效利用无线资源的目的。 The present invention uses high-order modulation method added duplicate multicast data transmission, poor channel conditions for users repeatedly use, good channel conditions for users to reduce the number of repetitions or non-repeating, savings can be used to transfer other data subchannels , so as to achieve the purpose of flexible and efficient use of radio resources.

附图说明 BRIEF DESCRIPTION

图l是基站和中继联合完成高效多播数据传输的示意图； 图2是基站和中继联合完成高效多播数据传输的消息流程图。 Figure l is a schematic view of data transmission efficiency of multicast base station and relay completed joint; FIG. 2 is a base station and the relay joint completion message flow diagram of multicast data transmission efficiency.

具体实施方式 Detailed ways

本发明由以下结构构成，在中继端的构成为： The present invention consists of a structure constituting the end of the relay:

101. 载波信号干扰噪声比接收模块，该模块接收从用户载波信号干扰噪声比报告模块302发来的载波信号干扰噪声比； 101. The interference and noise ratio of the carrier signal receiving module which receives the carrier signal to noise ratio from a user to interference and noise ratio of 302 sent to the interference reporting module carrier signal;

102. 多播调制编码模式判决模块，该模块从载波信号干扰噪声比接收模块101接收到的多个载波信号干扰噪声比中选择最小的值，并根据该值决定调制编码模式； 102. Multicast modulation coding mode decision module, the module carrier signal to interference and noise from the plurality of carrier to interference and noise ratio of the received signal 101 selects the smallest value than the receiving module, and the value is determined according to the modulation coding mode;

104. 多播调制编码模式接收模块，该模块接收来自基站的多播调制编码模式宣告模块203发送的调制编码方式，称之为最终调制编码方式； 104. The multi-mode receiving multicast modulation and coding module that receives a multicast modulation coding mode from a base station announcement module 203 sends a modulation coding scheme, the modulation and coding scheme is called a final;

105. 重复次数计算模块，该模块根据多播调制编码模式接收模块104接收到的最终调制编码方式，和多播调制编码模式判决模块102所决定的调制编码方式，计算出需要重复的次数；具体计算方法如下： 设多播调制编码模式判决模块102所决定的调制编码方式对应的频谱效率为x比特每秒每赫兹，多播调制编码模式接收模块104接收到的最终调制编码方式对应的频谱效率为y比特每秒每赫兹，系统可选的重复次数为rl, r2,…，rm，其中rKr2〈.,rm，（如802.16e系统支持l次，2次，4次和6次重复)，则计算得到的重复次数为集合(rl,r2, ...,m^中最小的大于y/x的值。 Calculation module 105. The number of repetitions, the final module receives modulation and coding scheme to the modulation coding mode according to the multicast receiving module 104, and a modulation and coding scheme multicast modulation coding mode decision module 102 is determined to calculate the required number of repetitions; Specific calculated as follows: multicast modulation and coding scheme set the modulation and coding mode decision module 102 corresponding to the determined spectral efficiency x bits per second per Hertz spectral efficiency modulation and coding scheme final modulation coding mode multicast receiving module 104 receives a corresponding y bits per Hertz as the system is optional repetitions per rl, r2, ..., rm, where rKr2 <., rm, (such as l 802.16e system supports time, two times, four times, and repeated 6 times), the calculated number of repetitions is set (rl, r2, ..., m ^ value is greater than the minimum of y / x.

106. 中继链路多播数据接收模块，该模块接收来自基站的中继链路多播数据发送模块204发来的多播数据； 106. The relay link multicast data receiving module that receives the relay link from a base station transmitting multicast data sent by the module 204 multicast data;

其中，访问链路定义为发送端或接收端的某一个为用户的链路；中继链路定义为发送端和接收端都不是用户的链路。 Wherein the access link is defined as the user transmitting side of a link or a receiving end of a; relay link is defined as the sending end and the receiving end of the link is not the user.

205. 访问链路多播数据发送模块，该模块根据多播调制编码模式宣告模块203宣告的多播调制编码方式，在访问链路上以该调制编码方式发送数据。 205. Access link module sending multicast data, the multicast modulation and coding scheme module 203 of the module is declared according to the multicast announcement modulation coding mode, the transmission data to the modulation and coding scheme on the access link.

在用户端的构成为： In the configuration of the client:

301. 载波信号干扰噪声比测量模块，该模块根据接收到的信号测量载波 Carrier signal 301. The interference and noise ratio measurement module, the module according to the received carrier signal measurements

信号干扰噪声比； Signal to interference noise ratio;

302. 载波信号干扰噪声比报告模块，该模块把载波信号干扰噪声比测量模块301测量到的载波信号干扰噪声比报告给中继或基站；303.多播数据接收模块，该模块接收来自基站，或中继，或基站和中继同时发出的多播数据。 Carrier signal 302. The interference and noise ratio reporting module, the module 301 the carrier signal to interference and noise ratio measurement module to measure the carrier signal to interference and noise ratio reports to a base station or a relay; 303 multicast data receiving module, which receives from the base station, or a relay or the base station and the relay multicast data simultaneously sent.

在上述结构的基础上，基站和中继协作多播数据的高效传输的示意图如附图l所示。 In the above configuration, the base station and the relay cooperation schematic efficient multicast transmission data as shown in the drawings l.附图2给出了消息的传递过程。 Figure 2 shows a message delivery process.

Claims (9)

Translated from Chinese

1.一种WiMax/WiBro中继系统的多播数据的传输方法，包括步骤： 用户向各自的中继站发送载波信号干扰噪声比； 中继的多波调制编码模式判决模块，从多个载波信号干扰比中选择最小值，并根据该值决定调制编码模式； 中继的多波调制编码模式报告模块，将调制编码模式发送给基站； 基站的多波调制编码模式选择模块，根据来自不同中继的多波调制编码模式选择其中速率最高的一个作为访问链路上多波数据的调制编码模式，并将该最终调制编码模式发送给中继； 基站的访问链路多波数据发送模块和中继的访问链路多波数据发送模块以基站确定的调制编码模式在访问链路上发送数据。 The method of transmitting multicast data A WiMax / WiBro relay system, comprising the steps of: each user of the transmission carrier signal to interference noise ratio of the relay station; relay multimode modulation coding mode decision module, a plurality of carrier signals from interfering than the selected minimum value, and decides the encoding mode based on the modulation value; relay multimode modulation coding mode reporting module, the modulation coding mode to a base station; a plurality of base stations wave modulation coding mode selection module, according to different relays from multi-wave modulation coding mode selected as the highest rate of the access link wherein a modulation coding mode of the multi-wave data and the modulation coding mode to a final relay; access link multimode base station and the relay of data transmission module multi-access link modulation wave data transmission module to the base station the determined coding mode to transmit data on the access link.

2. 根据权利要求l所述的方法，其特征在于还包括中继接收到基站发送的最终调制编码模式后计算向用户重复发送多播数据的次数。 2. The method as claimed in claim l, characterized by further comprising a relay after receiving the final modulation coding mode by the base station calculates the number of transmissions of the multicast data to the user is repeated.

3. 根据权利要求2所述的方法，其特征在于所述每个中继根据计算出的重复次数向用户发送多播数据。 3. The method according to claim 2, wherein each repeater transmits the multicast data to the user in accordance with the number of the repeatedly calculated.

4. 根据权利要求l所述的方法，其特征在于基站和中继给用户发送多播数据时，采用较高速率的调制编码方式，而非最差信道能够接受的调制编码方式。 4. The method of claim l, wherein the relay and the base station transmits multicast data to the user, using a higher rate modulation and coding scheme, rather than the worst channel acceptable modulation and coding scheme.

5.根据权利要求l所述的方法，其特征在于参与多播的中继和基站同时发送多播数据给用户。 5. The method according to claim l, characterized in that the participating multicast relay and base stations simultaneously transmit the multicast data to the user.

6. 根据权利要求l所述的方法，其特征在于中继选择覆盖范围内最低速率的调制编码方式。 6. The method as claimed in claim l, characterized in that the modulation and coding schemes selected in the relay coverage lowest rate.

7. 根据权利要求l所述的方法，其特征在于基站发送给用户多播数据时只重复一次。 7. The method according to claim l, wherein the base station transmits to repeat only once when the user multicast data.

8. 根据权利要求l所述的方法，其特征在于所述中继至少为一个。 8. The method according to claim l, characterized in that said at least one relay.

9. 根据权利要求l所述的方法，其特征在于所述用户至少为一个。 9. The method according to claim l, characterized in that said at least one user.